Yeah, when it comes right down to it, Zeitgeist IS entertainment designed to entertain the lay public (painful as it may be to call watching the pseudo-intellectual equivalent of TMZ as being "entertainment": more like torture for your brain!). Zeitgeist is trying to create and sell its own 'brand' (which it HAS done: there's been a few sequels, lapped up by gullible buyers who like this type of speculative "conspiracy hypothesis" stuff).
The Zeitgeist movie ironically engages in the same tactic that the Bible does: it mixes a historical background with TONS of speculation to create interesting stories. The producers of Zeitgeist learned the message of the Bible well.
The problem is Zeitgeist clearly oversteps the available evidence, eg claiming Jesus never existed and is the complete product of an ancient conspiracy (and the proper term is "conspiracy hypothesis", BTW, since there's no evidence to support the conclusion). Is it any wonder Alex Jones is a BIG fan of Zeitgeist?
It's a tad reminisent of those critics who claim the Tanakh is purely a product of the writer's imagination, without any historical basis to it, done to support Jewish claims to land which Palestinians also claim. These types of revisionist claims are going overboard without evidence to support, as archaeologist Bill Devers has pointed out that this IS available evidence that supports SOME of the claims in the Torah (eg Hebrew ruins are found in Palestine), although not ALL of the claims are true (eg there's no evidence for an Exodus from Egypt; instead, archaeological evidence points to indigenous Hebrew populations living in Palestine even LONG BEFORE the Exodus is said to have occurred).
If "Jesus never existed" didn't set off your alarm bells, Segment 2 and 3 of Zeitgeist SHOULD serve as a HUGE RED FLAG that the producer isn't concerned with examining the evidence that interferes with the story he wants to tell, but instead chooses to profit from the whole, "secrets THEY don't want you to know!" nonsense by claiming that 9/11 was an inside job, and the last segment on the optional nature of paying taxes (apparently Christian media troll Kent Hovind was a true believer of this claim, too, and is now serving time in a Fed Prison for his willful misunderstanding of Fed tax laws).
Zeitgeist SHOULD serve as a warning to all persons who THINK of themselves as rational and logical that the messages we MOST should scrutinize are the ones we most WANT to be true. People who show the ability to reason clearly suddenly shut down and turn off THEIR ability to think rationally when it's THEIR beliefs being examined! It's called cognitive selection bias, seeing only what we WANT to see, rather than see what actually IS. Your wants and wishes have NOTHING to do with whether something is TRUE or not, eg I may WANT to win the lottery, but random chance doesn't care what we WANT.
Unfortunately the over-reaction of skeptical viewers is to "throw out the baby with the bathwater", and it ALL gets dismissed as bollocks, but that's unwarranted, since it ignores how legends often grow out of kernels of truths. You have to decide if you want to let your desired conclusions LEAD the evidence, or to let the conclusions FOLLOW the evidence.
If you don't understand and/or accept that idea, you're only doomed to keep falling for the same nonsense the JWs were selling, only different flavors and permutations of it, time and time again.
PS Religiousity is slightly better, but AGAIN it's ENTERTAINMENT, not scholarly research and study. Even better are the movies and TV documentaries made by Richard Dawkins (Enemies of Reason, Root of All Evil, etc), as although it's ALSO entertainment, his claims are backed by citations and evidence; he's a biologist who shows more respect for evidence than the producers of Zeitgeist, and doesn't just go with what he WANTS to be true.
Adam